Win32/Spy.Backoff [Threat Name] go to Threat

Win32/Spy.Backoff.A [Threat Variant Name]

Category trojan
Size 110592 B
Detection created Jul 31, 2014
Detection database version 10185
Aliases Backdoor.Win32.Backoff.a (Kaspersky)
  Backdoor:Win32/Unskal.A (Microsoft)
  Trojan.Backoff (Symantec)
Short description

Win32/Spy.Backoff.A is a trojan that steals sensitive information. It can be controlled remotely.


When executed, the trojan copies itself into the following location:

  • %appdata%\­AdobeFlashPlayer\­mswinhost.exe

The trojan creates the following file:

  • %appdata%\­mskrnl (110592 B)

In order to be executed on every system start, the trojan sets the following Registry entry:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "Windows NT Service" = "%appdata%\­AdobeFlashPlayer\­mswinhost.exe"

The following Registry entry is set:

  • [HKEY_CURRENT_USER\­SOFTWARE\­Microsoft\­Windows\­CurrentVersion]
    • "identifier" = "%variable%"

A string with variable content is used instead of %variable% .

The trojan creates and runs a new thread with its own program code within the following processes:

  • explorer.exe

After the installation is complete, the trojan deletes the original executable file.

Information stealing

The trojan collects the following information:

  • operating system version
  • user name
  • computer name

The trojan searches memory of running processes and tries to find following information:

  • credit card information

The trojan is able to log keystrokes.

The trojan keeps various information in the following files:

  • %appdata%\­AdobeFlashPlayer\­Log.txt
Other information

The trojan acquires data and commands from a remote computer or the Internet.

The trojan contains a list of (3) URLs. The HTTP protocol is used.

It can execute the following operations:

  • download files from a remote computer and/or the Internet
  • run executable files
  • update itself to a newer version
  • uninstall itself
  • send gathered information

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